If you know what their interests and hobbies are at the moment, then get equipment and other stuff related to those. Books and craft supplies are often good ideas. A giftcard to a store they often visit is always nice. A nice mug is a good gift for many people, because it’s useful and beautiful. For kids, you can ask them what’s their favorite animal, and then get them a plushie of that animal. They’ll probably love it. Getting them a trendy toy (such as a Squishmallow rn) can also be good. If you still have no idea what someone wants, then you can get them a nice card with some cash and maybe some candy.